Diamond



FIG. 1 is a top plan view of a diamond showing our new design; and,

FIG. 2 is a side elevation view, it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design.

The portions of the stone shown in broken lines in FIG. 2 are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a diamond, shown and described in the drawings. 